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With only 24 hours left until Savitar murders Iris, Barry struggles to save the woman he loves and makes the choice to use any means necessary to do so. Realizing he has one option left to save her, the Flash turns to Captain Cold for help.

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Barry and the team meet Tracy Brand, a scientist who may be the key to stopping Savitar. Unfortunately, Killer Frost is also after Tracy, so Team Flash must battle their old friend, which proves to be particularly difficult for Cisco. Meanwhile, Joe and Cecile's relationship takes a big turn.

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Barry travels to 2024 to find out Savitar's still unknown identity in the hopes of saving Iris. He encounters future versions of his Team Flash friends, who, following the death of Iris, have become very different people. Meanwhile, back in the present, the hunt for Killer Frost continues.

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The Flash battles Abra Kadabra, a villain from Earth-19, who offers to reveal Savitar's true identity. Meanwhile, Julian remains cold towards Caitlin, but when she is severely injured in a battle with Gypsy, he rushes to her side.

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A crossover episode with "Supergirl" concludes. Barry and his team are surprised when Mon-El and Hank Henshaw arrive on their Earth carrying a comatose Supergirl who was whammied by the Music Meister. Unable to wake her up, they turn to Team Flash to save her. However, the Music Meister surprises The Flash and puts him in a similar coma. Kara and Barry wake up without their powers in an alternate reality where life is like a musical and the only way to escape is by following the script.

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Grodd and his army of gorillas bring the battle to Earth-1, but the Flash and his team try to stop them before they destroy Central City. Meanwhile, Gypsy returns to join the fight; and Jesse Quick decides she wants to stay with Wally on Earth-1.

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Barry and his team travel to Earth-2 to rescue Harry from Gorilla City, but are captured and brought to Grodd, who tells them he needs their help to stop Solovar, the leader of Gorilla City, from invading Earth-1. Meanwhile, back on Earth-1, Jesse and Kid Flash hit the streets to stop a metahuman who can control gravity.

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Barry and the team at S.T.A.R. Labs work together to bring down Clive Yorkin, a criminal meta-human who is methodically killing people by causing them to decompose at an accelerated rate. Joe becomes his next target, but it's Iris who is caught in the crossfire. Meanwhile, the Flash mentors Kid Flash and begins to elevate the newer speedster's training to another level.

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H.R.'s past catches up with him when a bounty hunter with vibe powers named Gypsy arrives in Central City to bring him back to Earth-19 to stand trial for his crime. It turns out inter-dimensional travel is illegal on their Earth. H.R. surrenders but when Barry and Cisco find out that H.R.'s only hope would be to challenge Gypsy to a fight to the death, they intercede and Cisco offers to fight Gypsy instead.

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Barry is tormented by his vision of the future where Iris is murdered by Savitar. When a criminal named Plunder shows up in Central City, Barry recalls the villain's presence in his vision of the future and fears that if he catches Plunder it will cement Iris' fate. Confused about Barry's hesitation to stop Plunder, Wally decides to step in as Kid Flash. Meanwhile, Caitlin offers Julian a job.

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Barry goes to Earth-3 to get advice from Jay Garrick on how to stop Savitar. Wally wants to help Barry fight Savitar and reveals that he's been training with H.R., which doesn't go over well with Barry. Meanwhile, old wound are reopened when Cisco faces his first Christmas without his brother Dante.

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A superhero crossover event continues with aliens attacking Central City and Barry asking the Green Arrow for help to stop them. But they soon realize the battle is bigger than they thought, so they track down the Legends of Tomorrow and Supergirl to help. Once all of the super friends are assembled, they come up with a plan to attack but a shocking secret related to Flashpoint is revealed and suddenly no one is sure who they can trust.

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Caitlin uses her powers to save Barry but, as her mother predicted, the effort unleashes her inner Killer Frost. Killer Frost then goes on a rampage looking for Dr. Alchemy, kidnapping Julian and battling both the Flash and Vibe. Meanwhile, Joe and H.R. have a heart-to-heart talk.

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Caitlin visits her mother, a renowned biomedical researcher, to see if she can help with her growing meta-human powers. But her mom treats her like a test subject, which results in a major confrontation. Meanwhile, a mysterious new meta-human attacks Central City, and Barry tries to convince Julian to let him assist on the case.

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Barry continues to train Jesse and when a new meta human, Mirror Master, appears on the scene he lets her tag along. But she defies one of Barry's orders, which leads to disaster. Meanwhile, Mirror Master teams with his old partner, Top, and looks to even a score with Snart.

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Magenta, a new meta who can control metal, terrorizes the city. Meanwhile, Barry and Team Flash reunite with Earth-2 Wells and Jesse, who has the powers of a speedster, but Wells is concerned about her safety and wants her to stop using her powers.

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Season 3 begins with Barry living his dream life and no longer having to be the one saving the city now that Kid Flash has taken over that duty. But soon disaster strikes and Barry must decide if he wants to continue to live in an alternate universe or return to his life as the Flash.